hi I have a fixed Ellsworth jig but it gives a 65 degree grind. Can any body tell me what the stick out would be to get a 55 degree grind. Now that I can work in the shop again I am finding I forgot how to do things. Heres my jig
Too many variables, with too little info- length of "peg", distance (horizontally and vertically) of the swivel seat from your grinding wheel, angle between the peg and your gouge, etc. Maybe loosely position your gouge in the jig, and use a bevel gauge to estimate the tangent angle where it contacts the wheel with various projections. [With the grinder turned off, obviously!] Measure the bevel with a protractor.
Now I am using the Wolverine system, and can not give you a perfect number for what you have.
But I also use raptor jigs that give me a repeatable angle every time. (I just can't eye ball it anymore, my old eyes never get it right).
So I went out just now and took a look. The raptor jigs come in 60. and 50, 45, 40 , and 35 degree.
Setting up my grinder at 60, and then at 50 degree, shortened the arm by 5/16".
So to my surprise, I decided to go to 40 degree and measure. that took another 7/16" off the 50.
So there is no magic number to take 10 degree steps. But if you just go a few 16ths at a time you will get there. just make sure you keep a diary.
The 'stick out' is 2". David Ellsworth grinds his gouges to 60 degrees, using his jig in conjunction with one of Don Gieger's solutions on a Wolverine system. Here's a link to a video where Don shows the setup (using a Varigrind jig).
Also, the jig you showed in your original post looks like one of Eddie Castelin's "Blackhawk" jigs. If so, it is not an Ellsworth jig … the angle of the leg is significantly different … and likely won't produce the desired results.
The bevel angle can be changed by tool projection and/or the jig pivot point, moving the support arm in/out. The jig arm angle affects the shape of the wings, as it controls the plane that the tool shaft swings thru.
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